Human Gene STK3 (ENST00000523601.5) Description and Page Index
  Description: Homo sapiens serine/threonine kinase 3 (STK3), transcript variant 2, mRNA. (from RefSeq NM_001256312)
Gencode Transcript: ENST00000523601.5
Gencode Gene: ENSG00000104375.17
Transcript (Including UTRs)
   Position: hg38 chr8:98,454,695-98,942,571 Size: 487,877 Total Exon Count: 13 Strand: -
Coding Region
   Position: hg38 chr8:98,455,842-98,883,756 Size: 427,915 Coding Exon Count: 11 

Page IndexSequence and LinksUniProtKB CommentsProtein StructureOther NamesMethods
Data last updated at UCSC: 2021-06-20 19:51:40

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-  Comments and Description Text from UniProtKB
  ID: STK3_HUMAN
DESCRIPTION: RecName: Full=Serine/threonine-protein kinase 3; EC=2.7.11.1; AltName: Full=Mammalian STE20-like protein kinase 2; Short=MST-2; AltName: Full=STE20-like kinase MST2; AltName: Full=Serine/threonine-protein kinase Krs-1; Contains: RecName: Full=Serine/threonine-protein kinase 3 36kDa subunit; Short=MST2/N; Contains: RecName: Full=Serine/threonine-protein kinase 3 20kDa subunit; Short=MST2/C;
FUNCTION: Stress-activated, pro-apoptotic kinase which, following caspase-cleavage, enters the nucleus and induces chromatin condensation followed by internucleosomal DNA fragmentation. Key component of the Hippo signaling pathway which plays a pivotal role in organ size control and tumor suppression by restricting proliferation and promoting apoptosis. The core of this pathway is composed of a kinase cascade wherein STK3/MST2 and STK4/MST1, in complex with its regulatory protein SAV1, phosphorylates and activates LATS1/2 in complex with its regulatory protein MOB1, which in turn phosphorylates and inactivates YAP1 oncoprotein and WWTR1/TAZ. Phosphorylation of YAP1 by LATS2 inhibits its translocation into the nucleus to regulate cellular genes important for cell proliferation, cell death, and cell migration. STK3/MST2 and STK4/MST1 are required to repress proliferation of mature hepatocytes, to prevent activation of facultative adult liver stem cells (oval cells), and to inhibit tumor formation. Phosphorylates NKX2-1 (By similarity). Phosphorylates NEK2 and plays a role in centrosome disjunction by regulating the localization of NEK2 to centrosome, and its ability to phosphorylate CROCC and CEP250. In conjunction with SAV1, activates the transcriptional activity of ESR1 through the modulation of its phosphorylation. Positively regulates RAF1 activation via suppression of the inhibitory phosphorylation of RAF1 on 'Ser-259'. Phosphorylates MOBKL1A and RASSF2. Phosphorylates MOBKL1B on 'Thr-74'. Acts cooperatively with MOBKL1B to activate STK38.
CATALYTIC ACTIVITY: ATP + a protein = ADP + a phosphoprotein.
COFACTOR: Magnesium.
ENZYME REGULATION: Inhibited by the C-terminal non-catalytic region. Activated by caspase-cleavage. Full activation also requires homodimerization and autophosphorylation of Thr-180, which are inhibited by the proto-oncogene product RAF1. Activated by RASSF1 which acts by preventing its dephosphorylation.
SUBUNIT: Homodimer; mediated via the coiled-coil region. Interacts with NORE1, which inhibits autoactivation (By similarity). Interacts with and stabilizes SAV1. Interacts with RAF1, which prevents dimerization and phosphorylation. Interacts with RASSF1. Interacts (via SARAH domain) with isoform 1 of NEK2. Interacts with ESR1 only in the presence of SAV1. Interacts with PKB/AKT1. Forms a tripartite complex with MOBKL1B and STK38. Interacts with RASSF2 (via SARAH domain).
INTERACTION: O95166:GABARAP; NbExp=2; IntAct=EBI-992580, EBI-712001; Q9H0R8:GABARAPL1; NbExp=2; IntAct=EBI-992580, EBI-746969; P60520:GABARAPL2; NbExp=2; IntAct=EBI-992580, EBI-720116; Q9GZQ8:MAP1LC3B; NbExp=5; IntAct=EBI-992580, EBI-373144; Q9BXW4:MAP1LC3C; NbExp=2; IntAct=EBI-992580, EBI-2603996; Q9NS23-2:RASSF1; NbExp=3; IntAct=EBI-992580, EBI-438698; Q8WWW0:RASSF5; NbExp=2; IntAct=EBI-992580, EBI-367390; Q9H4B6:SAV1; NbExp=6; IntAct=EBI-992580, EBI-1017775; Q13043:STK4; NbExp=3; IntAct=EBI-992580, EBI-367376;
SUBCELLULAR LOCATION: Cytoplasm (By similarity). Nucleus (By similarity). Note=The caspase-cleaved form cycles between nucleus and cytoplasm (By similarity). Phosphorylation at Thr-117 leads to inhibition of nuclear translocation.
TISSUE SPECIFICITY: Expressed at high levels in adult kidney, skeletal and placenta tissues and at very low levels in adult heart, lung and brain tissues.
INDUCTION: Activity increases during mitosis.
PTM: Phosphorylation at Thr-117 and Thr-384 by PKB/AKT1, leads to inhibition of its: cleavage, kinase activity, autophosphorylation at Thr-180, binding to RASSF1 and nuclear translocation, and increase in its binding to RAF1.
PTM: Proteolytically cleaved by caspase-3 during apoptosis. Proteolytic cleavage results in kinase activation and nuclear translocation of the truncated form (MST1/N).
SIMILARITY: Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. STE20 subfamily.
SIMILARITY: Contains 1 protein kinase domain.
SIMILARITY: Contains 1 SARAH domain.

-  Protein Domain and Structure Information
  InterPro Domains: Graphical view of domain structure
IPR011009 - Kinase-like_dom
IPR000719 - Prot_kinase_cat_dom
IPR017441 - Protein_kinase_ATP_BS
IPR011524 - SARAH
IPR024205 - SARAH_domain
IPR002290 - Ser/Thr_dual-sp_kinase_dom

Pfam Domains:
PF11629 - C terminal SARAH domain of Mst1
PF00069 - Protein kinase domain

ModBase Predicted Comparative 3D Structure on Q13188
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